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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Long-term Debt
Long-term debt consisted of the following: 
March 31, 2021March 31, 2020Dec. 31, 2020
 (Dollars in thousands)
Bank debt   
Bank revolving loans$137,000 $827,000 $— 
U.S. term loans400,000 — 900,000 
Other foreign bank revolving and term loans60,030 29,239 30,407 
Total bank debt597,030 856,239 930,407 
4¾% Senior Notes
300,000 300,000 300,000 
3¼% Senior Notes
763,945 713,490 795,307 
4⅛% Senior Notes600,000 600,000 600,000 
2¼% Senior Notes587,650 548,839 611,775 
1.4% Senior Secured Notes500,000 — — 
Finance leases33,936 32,582 34,480 
Total debt - principal3,382,561 3,051,150 3,271,969 
Less unamortized debt issuance costs and debt discount24,147 21,926 20,716 
Total debt3,358,414 3,029,224 3,251,253 
Less current portion195,122 854,653 28,036 
 $3,163,292 $2,174,571 $3,223,217